* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
li {
    list-style: none;
}
a {
    text-decoration: none;
}
@keyframes left_open_close {
    0% {
        transform: translateX(0px);
    }
    25% {
        transform: translateX(-100px);
    }
    75% {
        transform: translateX(-100px);
    }
    100% {
        transform: translateX(0px);
    }
}
@keyframes right_open_close {
    0% {
        transform: translateX(0px);
    }
    25% {
        transform: translateX(100px);
    }
    75% {
        transform: translateX(100px);
    }
    100% {
        transform: translateX(0px);
    }
}
section {
    position: relative;
    width: 1100px;
    height: 900px;
    margin: 20px auto;
    background-color: pink;
}
.elevator_framework {
    width: 400px;
    height: 100%;
    background-color:darkgrey;
    margin-left: 50px;
}
.floor_number {
    float: left;
    width: 200px;
    height: 100%;
    background-color:darkmagenta;
}
.floor_number ul li {
    height: 100px;
    width: 100%;
    border-left: 1px solid red;
    border-bottom: 1px solid red;
    text-align: center;
    line-height: 100px;
    font-size: 50px;
    font-weight: 700;
    color: #fff;
}
.elevator_area {
    position: relative;
    float: right;
    height: 100%;
    width: 50%;
    background-color: darksalmon;
    overflow: hidden;
}
.elevator_area .left_door {
    position: absolute;
    bottom: 0px;
    left: 0px;
    height: 100px;
    width: 50%;
    background-color:dodgerblue;
    animation-timing-function: ease;
    animation-delay: 1s;
    animation-fill-mode: forwards;
}
.elevator_area .left_open_close {
    animation-name: left_open_close;
    animation-duration: 4s;
}
.elevator_area .right_door {
    position: absolute;
    bottom: 0px;
    right: 0px;
    height: 100px;
    width: 50%;
    background-color:dodgerblue;
    animation-timing-function: ease;
    animation-delay: 1s;
    animation-fill-mode: forwards;
}
.door {
    border: 1px solid #fff;
}
.elevator_area .right_open_close {
    animation-name: right_open_close;
    animation-duration: 4s;
}
.keyword {
    position: absolute;
    right: 150px;
    top: 300px;
    width: 300px;
    height: 300px;
}
.keyword ul li {
    float: left;
    width: 100px;
    height: 100px;
    border: 1px solid #fff;
    border-radius: 50%;
}
.keyword ul li a {
    display: block;
    width: 100%;
    height: 100%;
    font-size: 50px;
    font-weight: 700;
    text-align: center;
    line-height: 100px;
    border-radius: 50%;
    background-color:darkgreen
    
}
.keyword ul li a:hover {
    background-color: gold;
}
